I am a software programmer using C#, C+, and (less often) PHP. I frequently work with SQL, HTML, CSS, Javascript, and XML.

I own a business for technical consulting, programming, general IT work, and designing custom electronics (usually for costumes and theater/movie prop use).

I enjoy computers, music composition, photography, writing, sci-fi/fantasy, birding, and occasional cooking. (Many of which are topics of SE sites!)

A note on capitalization, spelling, and grammar: I care about the quality and readability of the questions and answers on StackExchange sites. I frequently edit for these reasons. I understand that not everyone knows English as their first language. If I leave a comment for you asking you to observe some language-usage convention, it's meant as a helpful hint, not as an attack.

What is the name of the cable inside PC cases?To address your question about DC power adapters having two wires, whereas the PC power cable has four, this is because the PC power supply is providing two voltages (5 and 12 DC) instead of one. The logic circuitry for a hard drive, for example, will operate on 5V, while the stepper motor may require 12V. I added a pinout to the answer.

Aug18

comment

What is the name of the cable inside PC cases?PC power supplies typically are capable of supplying 200 or more watts, sufficient to power multiple hard drives, optical drives, etc. Manufacturers will usually provide cabling with several connectors intended for the end user to be able to add more devices without having to purchase splitters or new power supplies. Some computers (like mine at home) can have four or more hard drives in a RAID array, and having additional power connectors is necessary.